Robert c



June 3 1924. `1,495,989

R. c. DANLY AUTOMATI C WORK STOP Filed March 5. 1923 il Y J- l' :n: LW v Y l Patented June 3, 1924.

UNITED STATES PATENToFFIcr..

ROBERT C. DANLY, 0F CHICAGO, ILLINOIS, ASSIGNOR TO DANLY MACHINE SPECIAL- TIES, INC., OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

AUTOMATIC WORK s'ror.

Application led March 5, 1923. Serial No. 622,817.

To all 'whom t may concern.'

Be it known that I, ROBERT C. DANLY, a citizen of the United States of America, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Automatic Work Stops, of which the following is a specification.

This invention relates to automaticv stop mechanisms for punch presses and more especially for standard punch and die sets used in connection with such presses, and adapted to stop and position the stockor pla-tie material operated on after each successive operation of the punching mechanism, and this improvement has for its objectszf To provide a 'formation and combination of parts and elements in Vwhich a stop pin is moved from stop engagement with an opening in the stock operated on in the active stroke of the punch mechanism, and automatically shiftedinto a position of rest upon the top of saidv stock ready to-drop intoL stop engagement with a suceeding opening in said stock. f

To provi le-a formation and association of parts of an automatic stop mechanism adapted for ready and accurateapplication to `the stripper plate of a punching mechanism, all as will hereinafter more fully appear.

In the accompanying drawings 2- Fig. l, is a detail longitudinal section of the lower portionof a blanking punch and die set having the present improvement applied. l y

Fig. 2, is a plan view of the stripper plate with the improvement in place. Fig. 3', is a detail sectional elevation illustrating the position of the 'stop' mechanism parts with the stop pin in active `stop engagement in an opening vin the stock operated on to properly position the same. j

Fig. 4, is a companion view showing said stop pin above and resting upon the stock, ready to drop into a succeedingy openingrin said stock in a feed of thesame.

Fig. 5, is another companion view showing said stop pin dropped down into the .succeeding opening in the stock, and previous to the movement of the pin to the stop position shown in Fig. 3.

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Fig. 6, isa perspective'view of the parts of the stop mechanism in a detached position. l

Fig. 7, isa detail longitudinal section illustrating thestop mechanism applied to the movable stripper plate of'a punching and drawing type of die sets.

Like reference,y numerals indicate like parts in the several views.

In the drawings: 1,1 designates` the bed. plate or holder for the` die 2 of a punch and die set, adapted to be clamped in place on the bed of a punch press, and provided with the usual leader pins 3 for guiding engagement with an associated punch carrying head 4i, a portion of which is shown Fig. l, with said punch carrying head having attachment to and movement lwith the punch press plunger as usual.

a blanking punch and die set as-shown in Figs. l, 2 and 3 is formed on its underside with the usual guide throat or channel for the stock operated on. In such type, the stripper plate 5 is iXedly secured to kthe top `of the die 3 as shown. In the punchingand forming type ot punch and 'die sets shown in Fig. 7,-thevstripper plate 5 has limited vertical movement with relation tothe central upstanding portion of y the die 2, and has limited upward `movementunder the stress of a series'of `springs 7,. while its positive downward `movement is effected by the movablepunch carrying head of the set. The .construction soiar described has ybeen in general use for an extended periodl in modern manufacturing establishments in` this country.

8, designates a circular shouldered head adapted `to fit and be secured in a corre- .sponding shape orifice in the stripper plate 5, and in the present 'improvement the'head 8 is formed at its upper end with a central cross slot providing a pair of oriced ears 9 for the pivotal mounting of the hereinatter described rocker bar, .which is attained by a pivot 10 passing through the ears 9 and through said rocker bar.

4l1, designates `the rocker bar above -reerred to, pivoted at its mid-length in the head-8 by a pivot pin 9 aforesaid, and eX- tending longitudinally of the stripper plate 5. One arm 12 of said rocker bar is arranged'in a plane yabove the stripper plate i with its free end in the path of an adjustable contactl stem or bolt 13,v which in the construction shown in Fig. 1, is carried by the punch carrying head 4 of the mechanism, while in the lconstruction shown in Fig. 7, the stem or bolt V13 is carried by the die 2. In either construction the function attained is the rocking of the rocker bar 11, for the purpose hereinafter described. i

111, designates a spring arranged beneath *the ai'in 12 of the rocker bar 11, with a resilient tendencyto move said arm in an upward and opposite direction vto that effected by the stem or bolt 18 aforesaid.

The otherarml of the lrocker bar 11, has movement in a surface recess in the stiipper plate 5, and hasoperative connectionwith the stop pin for the stock, as follows 1G, designates an orifice extending verti- ,cally down through the stripper plate 5 and arranged in yspaced longitudinal relation to the orificel in whichv the aforesaid circular head 8 is arranged, and has connection with said orifice by a surface recess in the stripper plate 5', inwhich recess the arm 15 aforesaid has movement.

17, designates a cylindrical stoppin ar- 'ii'iiigecll in the orifice `16 aforesaid, and

adapted to have limited tilting movement as well as a vertical adjustment therein. In its working position, the lower end of the stop pin 17 rests upon the top surface of the die 2, and is located at a point in the guide throat. or channel of the stripper lplate 5 aforesaid, to engage and stop the stock operated on at the proper point for a punching operation, and withv a View toaii effective automatic operation, the stop pin 17 is operativelyronnected -to the arm 15 of the rocker bar 11 by intermediate means as .follows 1S, designates a longitudinal guide bore in the rock bar arm 15, adapted to receive an inner spring member 19 and an outer sliding plug 20, the outer end of which plug is of a rounded formation adapted for operative engagement in a lateral recess 21, in

j the upper end of the stop pin 17 as shown.

With the described construction. the

yspring 19 and plug 20 tends to hold the stop 3, in which position the parts remain during a punching operation. lith a descent of the punch carrying head 4, the contact stem or bolt 13, operatively engages the arm 12 of the rocker arm 11 to impart a on a succeeding feed of said stock as illustrated in Fig. 5, and prior to the full feed of said stock into the first described position shown in Fig. 3.

Having thus fully described my invention what I claim as new and desire tosecure by Letters Patent, is y 1. In an automatic work stop for punch and die mechanisms, the combination of'a rocker bar mounted onthe stripper plate of the mechanism, a stop pin arranged in `a vertical orilicevlin said stripper plate and adapted to have a limited tilting movement(l as well as vertical adjustment in saidorifice,

one arm of therocker barhaving resilient operative connection with said stop pin, and an adjustable abutment stem adapted for operative engagement with other arm of the rocker bar in an active stroke of the punch and die mechanism.

2; In lan automatic work stop for punch and die mechanisms, the combination of a rocker bar mounted on the stripper plate of the mechanism, a stop pin arranged in a vertical orifice in said stripper plate and adapted to have a limited tilting movement as well as vertical adjustment in said orifice, one arni of the rocker bar having a longitudinal recess, an inner spring and a movablerouter plug arranged in said recess with the outer end, 4a rocker bar pivoted at its mid-length in said slot, a vstop pinarranged in a. verti-l cal orifice in said stripper plate and adapted to have a limited tilting movement as well as a vertical adjustment in said orifice, one arm of the rocker bar having resilient operative connection with said stop pin, and an adjustable abutment stem adapted for operative engagement with the other arm of the rocker bar in an active stroke o-f the punch i and die mechanism.

t. In an automatic work stop for punch and die mechanisms, the combination of a shouldered head adapted for attachment in an orifice in the stripper plate of the mechanism and formed with a slot in its upper end,

a rocker bar pivoted at its mid-length in Said slot, a stop pin arranged in a vertical orifice in said stripper plate and adapted to have a limited tilting movement as Well as a vertical adjustment in said orifice, one arm of the rocker bar having a longitudinal recess, an inner spring and a movable outer plug arranged in said recess with the outer end of the plug lia-ving operative engagement in a lateral recess in the stop pin afore-v 10 Signed at Chicago, Illinois, this 2nd day 15 of March, 1923. v

ROBERT C. DANLY. 

